Fully fashioned stockings
Fully fashioned stockings (FFS), are stockings with characteristic reinforcements on the heel and top, a so-called keyhole at the back of the top, and a stitched back seam in between. They are made to be worn with a garter belt and are today considered a vintage design of hosiery after largely having been replaced by seamless stockings and pantyhose from the 1960s onwards.
Source: Wikipedia — Fully fashioned stockings (CC BY-SA 4.0)